Surfacing machine abrasive sheet holder



June 11, 1940. E. Eil-GEORGE 2f204486 ySURFACI-NG NACHI-[NE ABRASIVE SHEET HOLDER Filed sept. 9.. 1939 W f w v l INVENTOR.

` ATTORNEY;

50 'I'he ends of the pad plate I4 are turned uproller 2l snugly clamped aainstthe Cooperating' 50 Patented June 11, A1940- I l 'I l UNITED STATES .PMI-:NTI OFFICE sUnFAcING MACHINE ABRAsIvE SHEET HOLDER Edward B. George, chicago, nl.

Application September 9, 1939, Serial No. 294,124

,6 Claims. (Cl. 51189) This invention relates to surfacing machines suitable material is interposed between the plate of the general type exemplified in my pending I4 and the abrasive sheet I8. Ametallic member application Serial No. 216,004, filed June 27, 1938, 2I, which also acts as a clamp for the lower end and more particularly to an improved means forof one of the flexible connections I5, has its ends `5 detachably clamping and holding the abrasive downturned and provided with openings to re- 5 sheet to the plate or frame by which the sheet ceive the inturned ends of a U-shaped holding is carried. member 22 which is thereby pivoted at the points A primary purpose of my invention is to pro- 23 and 24 to the member 2l, which in turn is vide means for -securely clamping and holding rigidly fixed to the plete I4 by the bolts 25. The the sheet in position so that it will not work holding member 22 is of such length that it can 1o loose or become detached during operation of be forced under pressure beneath the inturned the machine. In conjunction with the foregoing end ll of the plate i4 et the left of the deVioe purpose, my'novel means is designed to be easily Viewing Fig. 1 to thereby Clamp the folded end manipulated for the release of the sheet when of the abrasive sheet against displacement 'A l5 replacement thereof as the result of wear beroller 26 kmounted on the transversely extending 15 Comes necessary and also easily manipulated end portion of the clamping member facilitates into locking position to hold the replaced sheet the positioning of the Clamping member in opagainst displacement. eratlve relation to the plate end I1 and its re- To facilitate an understanding of my inven.. moval therefrom, and also assists in the clamption, a preferred embodiment thereof is illuslng of the abrasive Sheet in position '20 trated on the accompanying drawing, referring Intermediate their ends. the legs of the elempto which: ing member 22 are offset, asy indicated in 21, and Fig. 1 is a 'side elevation partiauy in section in proximity t0 the offset a coiled expansion of a surfacing machine equipped with my invenspring 28 is anchored on each leg at 29.- The g5 tion; expanded position of these springs is shown in 25 Fig. 2 is a similar view showing the sheet 1cck- Fis. 2- A seeond clamping member 3l 0I ing means in released position; and U-shape also provided on its cross member with Fig. 3 is a sectional view on the line 3 3 of a roller 32 has its free ends looped around mem- Fig. 1. ber 22, as indicated at 33. When this member is 30 The machine generally comprises a base 5 cardisposed in operative position with its roller 32 30 rying a housing 6 in which is mounted a motor, in cooperative relation with the right hand, upthe drive shaft l of which is equipped with a turned end I1 of the pad plate, the roller 32 is pinion a driving an internal gear s mounted on urged into clamping position by springs 28. as` a shaft II which at its lower end carries a crank illustrated in Figs. 1 and 3.

' on which a ball bearing ring I2 is mounted. 'Ihis In' mounting an abrasive Sheet upon the ma' 35 ring is disposed within an open topped, upwardly chine, the right hand end is first folded over projecting guideway I3 xcd to the upper face of the upward extension `I'I of the plate I4, wherethe pad-carrying plate or frame I4. 'I'hrough upon the member 3l is' forced to the left against this drive mechanism the rotation of the motor the oetion of Springs 23 until the roller 32 can 40 shaft 1 1s converted into en endwise reciprcca- -be pressed-down into the position shown in Fis. 1 40 tory movement of the plate I4. 'I'his plate is Where lt is held bythe springs 28- The Opposite connected with the motor base 5 through flexible end of the sheet is then foldedover the left hand. connections I5 which permit the reciprocatory Uptllrhed end of the plete, whereupon roller 26 is movements of the pad plate to take place wIthpressed doWn into clamping position. It Will be out transmitting excessive vibrations to the hannoted that Clamping member 2v2 When in elemP- 46 die -I6 of the motor housing which is grasped by lng position is' slightly bowed upwardly interthe hand of the operator. The structure thus mediate its ends, and being made of stiff wire, far briefly described is explained more in detail this slight bending of the legs Aof the member in my pending application above mentioned. provides sufliclent resiliency to maintain the wardly and slightly inwardly, as indicated. at end of the pad plate. In this manner both ends I'I," and the ends of the abrasive sheet Il are of the vabrasive sheet are firmly clamped and folded over these upturned ends, as illustrated held in position during theoperation ,of the main the drawing. chine. To release the sheet a reversal of the A resilient pad Il of sponge rubber or other operations above described is followed. 55

It will be apparent from the foregoing that I have provided a simple and inexpensive means for positively and eiectively locking the abrasive sheet in working position, and that sheet can be quickly and easily released for removal when necessary. The holding device is simple in construction, reliable in operation, and can be readily manipulated from locking to unlocking position and vice versa.

The structural details illustrated and described are obviously capable of considerable modification within the scope of the invention as defined in the following claims.

I claim:

1. A device of the character described comprising a plate having upturned ends, a holding member pivoted on said plate in position to clampingiy cooperate with one oi said ends, a second holding member mounted on said first member and adapted to clampingly cooperate with the other end of said plate, and spring means 'interposed between said members for yieldingly urging said members apart.

2. In a holder for an abrasive sheet, the combinationA of a member having upwardly and inwardly turned ends, a U-shaped clamping member pivoted at its open end to said rst-mentioned member in position to clampingly cooperate with one of said upturned ends, a second U- shaped member connected at its open end to said first U-shaped member, and springs interposed between said members. l

3. In an abrasive sheet holding device, the

combination of a plate having upwardly and in Wardiy turned ends, a U-shaped holding member pivoted on said plate in position to clampingly cooperate with one of said upturned ends, a second U-shaped clamping member mounted on said rst clamping member in position to clampingly cooperate with the other of said upturned ends, and springs for yieldingly urging the ends of said clamping members apart.

4. In an abrasive sheet holding device, the combination of a plate having upturned ends. a clamping member pivoted on said plate and provided with a roller adapted to clampinglyV cooperate with one of said upturned ends, a second clamping member mounted on said first clamping member and provided with a roller adapted to cooperate with the other of said upturned ends, and spring means tending to urge said rollers into clamping position.

5. In a surfacing machine, the combination of a pad plate provided with upturned ends, a U- shaped member pivoted on said plate and provided with aroller, a second U-shaped member mounted on said rst member and provided with a roller, and spring means for inducing a relative separation between said rollers. y

6. In a surfacing machine, the combination of a plate having upwardly and inwardly turned ends, an abrasive sheet having its ends folded over said upturned ends, and a holding device Y comprising a pair of U-shaped members, one of said members being pivoted on said plate and the other being slidably mounted on said one member and expansion springs interposed between said members.

EDWARD E. GEORGE. 

